Design principles codify the behavioral research and/or design research known about specific User Experience topics.

The term can also be used to describe the driving behavior behind a design or a design group. In other words Fitt's Law is a design principle that explains the relationship between an object and its target. "Set users up for success" is a design principle that describes one of any good company's design goals.

It's worth noting that many of the design principles listed below are Heuristics- that is to say, they're practical methods to decision making sufficient for immediate goals, but not always appropriate for in-depth or complex decisions.

Characters and Principles of UX

For Richard, Characteristics are a vector between two points, and a user may be closer to one side or another. For each of those items we've listed the characteristic, its explanation, and the range from one side to the other. Richard lists only three principles: Relevant, Comprehensible, and Aesthetic. For a deeper explanation of each, access the PDF or visit the website.